CVE-2020-25017 : Vulnerability Insights and Analysis

Envoy through 1.15.0 has a vulnerability where it only considers the first value when multiple header values are present for certain HTTP headers, impacting the setCopy() header map API.

Understanding CVE-2020-25017

This CVE identifies a specific issue in Envoy that affects how it handles multiple header values.

What is CVE-2020-25017?

Envoy through version 1.15.0 has a flaw where it does not properly handle multiple header values for certain HTTP headers, leading to potential security risks.

The Impact of CVE-2020-25017

The vulnerability in Envoy could allow malicious actors to manipulate header values, potentially leading to security breaches or data manipulation.

Technical Details of CVE-2020-25017

This section delves into the technical aspects of the CVE.

Vulnerability Description

Envoy's setCopy() header map API fails to replace all existing occurrences of a non-inline header when multiple header values are present, impacting the integrity of header data.

Affected Systems and Versions

Product: N/A
Vendor: N/A
Versions: Envoy through 1.15.0

Exploitation Mechanism

The vulnerability can be exploited by sending crafted HTTP requests with multiple header values, taking advantage of Envoy's incorrect handling of such headers.

Mitigation and Prevention

Protecting systems from CVE-2020-25017 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Envoy to a patched version that addresses the header value handling issue.
Monitor network traffic for any suspicious activity related to header manipulation.

Long-Term Security Practices

Implement strict header value validation mechanisms in web applications.
Regularly review and update security configurations to prevent similar vulnerabilities.

Patching and Updates

Ensure timely application of security patches provided by Envoy to mitigate the CVE-2020-25017 vulnerability.